Hi Marco,
this goes beyond what SPARQL has been designed for. It would be doable
if SPARQL were an imperative programming language, but it's a query
language. You cannot even be sure in which order the various elements
of a WHERE clause are executed. It's therefore very difficult and
"artificial" to implement such an increment function. We would also
need to store some state, e.g. "previous iteration value" at execution
time, and I don't yet see how this could be done easily (think about
multi-threading issues, repeated execution etc).
Having said all this, there is a property function tops:for that
allows you to do something like
SELECT *
WHERE {
?index tops:for (1 10) .
...
}
to bind ?index with all values from 1 to 10. However, this won't do
what you are looking for by itself, because it will return multiple
bindings for all combinations of result variables. Depending on the
details of the where clause in your query, you may be able to achieve
what you want using SPARQLMotion.
Could you explain your use case so that we can brainstorm about
possible "clean" solutions? Thanks.
Holger
On Jun 3, 2009, at 6:37 AM, Marco Neumann wrote:
> Hi,
>
> Do we have a number generator available in the TBC SPARQL vocabulary
> that allows me to prefix a result set with an incrementing number?
>
> Like
> rank | name
> --------------
> 1 | Mike
> 2 | Paul
> 3 | Liz
>
> Marco
>
>
>
>
> >
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